{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Koutecky - Levich analysis of the samples indicates a transition of the total number of electrons transferred ( n ) in the electrochemical oxygen reduction reaction from two to four electrons upon increasing the surface concentration of platinum atoms ."}
{"Chemical": ["oxygen", "platinum"]}